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<h2>Co che uy quyen - su kien</h2>

de xac dinh nhung phuong thuc chi biet duoc luc thuc thi

Up quyen - delegate

Multicasting
 muc dich de 1 uy quyen co the goi nhieu hon 1 hanh dong
 cho phep goi 2 phuong thuc trong 1 uy quyen don

Co che publishing va subscribing
	1 doi tuong publish 1 tap hop cho cac lop khac dang ki.
	vi du cac nut dang ki nhan thong bao khi 1 button duoc click
	thi nut nay la publisher, con nhung nut dang ki su kien la subcriber

Su kien va delegate
	Su kien trong c# duoc thuc thi voi nhung delegate
	lop publisher dinh nghia 1 delegate va nhung lop subcriber phai thuc thi
	khi 1 su kien xuat hien thi phuong thuc cua lop subcriber duoc goi thong qua delegate

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